/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.solr.servlet;

import java.io.InputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.solr.core.CoreContainer;

/**
 * A simple servlet to load the Solr Admin UI
 * 
 * @since solr 4.0
 */
public final class LoadAdminUiServlet extends HttpServlet {

	@Override
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html");

		PrintWriter out = response.getWriter();
		InputStream in = getServletContext().getResourceAsStream("/admin.html");
		if (in != null) {
			try {
				// This attribute is set by the SolrDispatchFilter
				CoreContainer cores = (CoreContainer) request
						.getAttribute("org.apache.solr.CoreContainer");

				String html = IOUtils.toString(in, "UTF-8");

				String[] search = new String[] { "${contextPath}",
						"${adminPath}" };
				String[] replace = new String[] {
						StringEscapeUtils.escapeJavaScript(request
								.getContextPath()),
						StringEscapeUtils
								.escapeJavaScript(cores.getAdminPath()) };

				out.println(StringUtils.replaceEach(html, search, replace));
			} finally {
				IOUtils.closeQuietly(in);
			}
		} else {
			out.println("solr");
		}
	}

	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		doGet(request, response);
	}
}
